docs: def city_nums():
    """
    Get a dictionary of Backpage city names mapped to their 'legend' value.
  
    Returns:
      dictionary of Backpage city names mapped to their numeric value
    """
    city_nums = {}
    first_row = 1
    num = 0
    fname = pkg_resources.resource_filename(__name__, 'resources/Distance_Matrix.csv')
    with open(fname, 'rU') as csvfile:
      reader = csv.reader(csvfile, delimiter = ',')
      for row in reader:
        if first_row == 1:
          first_row = 0
        else:
          city_nums[row[0]] = num
          num = num + 1
  
    return city_nums